1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | * Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org> |
4 | * Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org> |
5 | */ |
6 | #ifndef _PARISC64_KERNEL_SIGNAL32_H |
7 | #define _PARISC64_KERNEL_SIGNAL32_H |
8 | |
9 | #include <linux/compat.h> |
10 | |
11 | /* 32-bit ucontext as seen from an 64-bit kernel */ |
12 | struct compat_ucontext { |
13 | compat_uint_t uc_flags; |
14 | compat_uptr_t uc_link; |
15 | compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/ |
16 | /* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */ |
17 | compat_uint_t pad[1]; |
18 | struct compat_sigcontext uc_mcontext; |
19 | compat_sigset_t uc_sigmask; /* mask last for extensibility */ |
20 | }; |
21 | |
22 | /* ELF32 signal handling */ |
23 | |
24 | /* In a deft move of uber-hackery, we decide to carry the top half of all |
25 | * 64-bit registers in a non-portable, non-ABI, hidden structure. |
26 | * Userspace can read the hidden structure if it *wants* but is never |
27 | * guaranteed to be in the same place. In fact the uc_sigmask from the |
28 | * ucontext_t structure may push the hidden register file downards |
29 | */ |
30 | struct compat_regfile { |
31 | /* Upper half of all the 64-bit registers that were truncated |
32 | on a copy to a 32-bit userspace */ |
33 | compat_int_t rf_gr[32]; |
34 | compat_int_t rf_iasq[2]; |
35 | compat_int_t rf_iaoq[2]; |
36 | compat_int_t rf_sar; |
37 | }; |
38 | |
39 | struct compat_rt_sigframe { |
40 | unsigned int tramp[2]; /* holds original return address */ |
41 | compat_siginfo_t info; |
42 | struct compat_ucontext uc; |
43 | /* Hidden location of truncated registers, *must* be last. */ |
44 | struct compat_regfile regs; |
45 | }; |
46 | |
47 | /* |
48 | * The 32-bit ABI wants at least 48 bytes for a function call frame: |
49 | * 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of |
50 | * which Linux/parisc uses is sp-20 for the saved return pointer...) |
51 | * Then, the stack pointer must be rounded to a cache line (64 bytes). |
52 | */ |
53 | #define SIGFRAME32 64 |
54 | #define FUNCTIONCALLFRAME32 48 |
55 | #define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32) |
56 | |
57 | long restore_sigcontext32(struct compat_sigcontext __user *sc, |
58 | struct compat_regfile __user *rf, |
59 | struct pt_regs *regs); |
60 | long setup_sigcontext32(struct compat_sigcontext __user *sc, |
61 | struct compat_regfile __user *rf, |
62 | struct pt_regs *regs, int in_syscall); |
63 | |
64 | #endif |
65 | |